Re: contributing
I think if you can tell them about the clubs you're interested in, list a few leadership roles you want to take on, and explain how you will use your unique background to benefit your classmates, you've got a pretty good answer.
During my interview, I talked about the clubs I wanted to join, and mentioned that I had spoken with officers of these clubs about elections and leadership positions.
I tied my work experience into ways I could help my core group members.
I also mentioned that current students had all been very helpful, and that I looked forward to the opportunity to help out next year's round of prospectives.
Hope this helps. Good luck!
Thanks for the advice! AMBA applicant here. I submitted my application on 11/17 and went under review on 12/10. I got my invite on 1/23 and will be heading to Ithaca next Monday. Keeping my fingers crossed.